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8Drive <br /> D Sequoia MorganHill <br /> CA CA 95037 <br /> mW Analytical FAX(408)776 9600 <br /> (408)782 6308 <br /> www sequotalabs com • <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNI0277 <br /> 3017 Kilgore Rd Suite 100 Project Number NIP Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09/23/04 16 56 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lama Notes <br /> Batch 4114008-EPA 5030B P/T <br /> Blank(4I14008-BLK1) Prepared&Analyzed 09/14/04 <br /> Methyl tent-butyl ether ND 050 ug/1 <br /> Gasoline Range Organics(C4 C12) ND 50 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1 2-Drchlaroethane-d4 558 500 111 78 119 <br /> Laboratory Control Sample(4114008-BS1) Prepared&Analyzed 09/14/04 <br /> Methyl tert-butyl ether 9 71 050 ug/l 100 97 63-137 <br /> Benzene 102 050 100 102 69-124 <br /> Toluene 110 050 100 110 78 129 <br /> Ethylbenzene 112 050 100 112 84-132 <br /> Xylenes(total) 332 050 300 11 1 83-137 <br /> Surrogate 1 2-Drchlaroethane d4 .580 5 00 116 78-129 <br /> Laboratory Control Sample(4I14008-BS2) Prepared&Analyzed 09/14/04 <br /> Methyl tert-butyl ether 817 050 ugll 992 82 63 137 <br /> Gasoline Range Organics(C4-C 12) 423 50 440 96 70 124 <br /> Benzene 5 32 0 50 640 83 69 124 <br /> Toluene 335 050 319 105 78 129 <br /> Ethylbenzene 769 050 7 52 102 84-132 <br /> Xylenes(total) 378 0 50 366 103 83 137 <br /> Surrogate 1 2-Dichloroethone-d4 S 52 500 110 78-119 <br /> Laboratory Control Sample Da (4I14008-BSD2) Prepared&Analyzed 09/14/04 <br /> Methyl tert butyl ether 807 050 ug/l 992 81 63 137 1 20 <br /> Gasoline Range Organics(C4-C 12) 418 50 440 95 70 124 1 20 <br /> Benzene 536 050 640 84 69 124 0 7 20 <br /> Toluene 342 050 319 107 78 129 2 20 <br /> Ethylbenzene 846 050 7 52 112 84 132 10 20 <br /> Xylenes(total) 416 050 366 114 83 137 10 20 <br /> Surrogate 1 1-Dichloroethane-d4 5 68 500 114 78 129 <br /> Sequoia Analytical-Morgan Hill The results in thea report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis . <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 15 <br />